Repository : ssh://git@open-mesh.org/alfred

On branch : master

commit db434ce1a82e6564125eba11667c0806cfa6eda9 Author: Simon Wunderlich siwu@hrz.tu-chemnitz.de Date: Sun May 5 14:32:42 2013 +0200

alfred: add README text and LICENSE

Signed-off-by: Simon Wunderlich siwu@hrz.tu-chemnitz.de

db434ce1a82e6564125eba11667c0806cfa6eda9 LICENSE | 339 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ README | 192 +++++++++++++++++++++++++++++++++++- 2 files changed, 529 insertions(+), 2 deletions(-)

diff --git a/LICENSE b/LICENSE new file mode 100644 index 0000000..d159169 --- /dev/null +++ b/LICENSE @@ -0,0 +1,339 @@ + GNU GENERAL PUBLIC LICENSE + Version 2, June 1991 + + Copyright (C) 1989, 1991 Free Software Foundation, Inc., + 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA + Everyone is permitted to copy and distribute verbatim copies + of this license document, but changing it is not allowed. + + Preamble + + The licenses for most software are designed to take away your +freedom to share and change it. By contrast, the GNU General Public +License is intended to guarantee your freedom to share and change free +software--to make sure the software is free for all its users. This +General Public License applies to most of the Free Software +Foundation's software and to any other program whose authors commit to +using it. (Some other Free Software Foundation software is covered by +the GNU Lesser General Public License instead.) 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If this is what you want to do, use the GNU Lesser General +Public License instead of this License. diff --git a/README b/README index 8f91d05..c01ce6c 100644 --- a/README +++ b/README @@ -1,6 +1,194 @@ A.L.F.R.E.D - Almight Lightweight Fact Remote Exchange Daemon -------------------------------------------------------------

-"alfred is a user space daemon to efficiently[tm] flood the network with useless data - like vis, weather data, network notes, etc" - Marek Lindner, 2012 +"alfred is a user space daemon to efficiently[tm] flood the network with + useless data - like vis, weather data, network notes, etc" + - Marek Lindner, 2012 + +Introduction +------------ + +alfred is a user space daemon for distributing arbitrary local information over +the mesh/network in a decentralized fashion. This data can be anything which +appears to be useful - originally designed to replace the batman-adv +visualization (vis), you may distribute hostnames, phone books, administration +information, DNS information, the local weather forecast ... + +alfred runs as daemon in the background of the system. A user may insert +information by using the alfred binary in client mode, or use special programs +to communicate with alfred (done via unix sockets). alfred then takes care of +distributing the local infomration to other alfred servers on other nodes. +This is done via IPv6 link-local multicast, and does not require any +configuration. A user can request data from alfred, and will receive the +information available from all alfred servers in the network. + +Compilation +----------- + +alfred depends on: + * librt (usually part of libc) + * IPv6 support in the kernel/host system + +To compile alfred, simply type: + + $ make + +This will compile both alfred and vis. To install, use + + $ make install + +(with the right privileges). + +If you don't want to compile vis, add the directive CONFIG_ALFRED_VIS=n: + + $ make CONFIG_ALFRED_VIS=n + $ make CONFIG_ALFRED_VIS=n install + +Usage +----- + +First, alfred must run as server to be used. This can either be done by some +init-scripts from your distribution (if you have received alfred as a package +with your distribution). Please see their documentation how to configure alfred +in this case. In any case, you can still run alfred from the command line. The +relevant options are: + + -i, --interface specify the interface to listen on + -b specify the batman-adv interface configured on + the system (default: bat0). use 'none' to disable + the batman-adv based best server selection + -m, --master start up the daemon in master mode, which + accepts data from slaves and synces it with + other masters + +The -b option is optional, and only needed if you run alfred on a batman-adv +interface not called bat0, or if you don't use batman-adv at all +(use '-b none'). In this case, alfred will still work but will not be able to +find the best next server based on metrics. + +alfred servers may either run as master or slave in the network. Masters will +announce their status via broadcast, so that slaves can find them. Slaves will +then send their data to their nearest master (based on TQ). Masters will +exchange their data (which they have received from slaves or got on their own) +with other masters. By using masters and slaves, overhead can be reduced while +still keeping redundancy (by having multiple masters). Obviously, at least one +master must be present in the network to let any data exchange happen. Also +having all nodes in master mode is possible (for maximum decentrality and +overhead). + +To put it together, let us start alfred in master mode on our bridge br0 +(assuming that this bridge includes the batman interface bat0): + + $ alfred -i br0 -m + +Now that the server is running, let us input some data. This can be done by +using the alfred binary in client mode: + + $ cat /etc/hostname | alfred -s 64 + +This will set the hostname as data for datatype 64. Note that 0 - 63 are reserved +(please send us an e-mail if you want to register a datatype), and can not be +used on the commandline. We skip the version paramter here, where you could +specify which version this data has and filter for it. Skipping the parameter +is as setting the parameter to 0 ('-V 0'). + +After the hostname has been set on a few alfred hosts, the can be retrieved again: + + $ alfred -r 64 +{ "fe:f1:00:00:01:01", "OpenWRT-node-1\x0a" }, +{ "fe:f1:00:00:02:01", "OpenWRT-node-2\x0a" }, +{ "fe:f1:00:00:03:01", "OpenWRT-node-3\x0a" }, + +Note that the information must be periodically written again to alfred, otherwise +it will timeout and alfred will forget about it (after 10 minutes). + +Vis +--- + +Vis can be used to visualize your batman-adv mesh network. It read the neighbor +information and local client table and distributes this information via alfred +in the network. By gathering this local information, any vis node can get the +whole picture of the network. + +Vis, similar to to alfred, combines server and client functionality in the 'vis' +binary. The vis server must be started to let vis work: + + $ vis -i bat0 -s + +This server will read the neighbor and client information from batman-adv every +10 seconds and set it in alfred via unix socket. Obviously, the alfred server +must run too to get this information set. + +To get a graphviz-compatible vis output, simply type: + $ vis +digraph { + subgraph "cluster_fe:f0:00:00:04:01" { + "fe:f0:00:00:04:01" + } + "fe:f0:00:00:04:01" -> "fe:f0:00:00:05:01" [label="1.000"] + "fe:f0:00:00:04:01" -> "fe:f0:00:00:03:01" [label="1.004"] + "fe:f0:00:00:04:01" -> "00:00:43:05:00:04" [label="TT"] + "fe:f0:00:00:04:01" -> "fe:f1:00:00:04:01" [label="TT"] + subgraph "cluster_fe:f0:00:00:02:01" { + "fe:f0:00:00:02:01" + } + "fe:f0:00:00:02:01" -> "fe:f0:00:00:03:01" [label="1.000"] + "fe:f0:00:00:02:01" -> "fe:f0:00:00:01:01" [label="1.008"] + "fe:f0:00:00:02:01" -> "fe:f0:00:00:08:01" [label="1.000"] + "fe:f0:00:00:02:01" -> "fe:f1:00:00:02:01" [label="TT"] + "fe:f0:00:00:02:01" -> "00:00:43:05:00:02" [label="TT"] + subgraph "cluster_fe:f0:00:00:08:01" { + "fe:f0:00:00:08:01" + } +[...] +} + +For a json formatted output, use: + + $ vis -f json +{ "primary" : "fe:f0:00:00:04:01" } +{ "router" : "fe:f0:00:00:04:01", "neighbor" : "fe:f0:00:00:05:01", "label" : "1.000" } +{ "router" : "fe:f0:00:00:04:01", "neighbor" : "fe:f0:00:00:03:01", "label" : "1.008" } +{ "router" : "fe:f0:00:00:04:01", "gateway" : "00:00:43:05:00:04", "label" : "TT" } +{ "router" : "fe:f0:00:00:04:01", "gateway" : "fe:f1:00:00:04:01", "label" : "TT" } +{ "primary" : "fe:f0:00:00:02:01" } +{ "router" : "fe:f0:00:00:02:01", "neighbor" : "fe:f0:00:00:03:01", "label" : "1.000" } +{ "router" : "fe:f0:00:00:02:01", "neighbor" : "fe:f0:00:00:01:01", "label" : "1.016" } +{ "router" : "fe:f0:00:00:02:01", "neighbor" : "fe:f0:00:00:08:01", "label" : "1.000" } +{ "router" : "fe:f0:00:00:02:01", "gateway" : "fe:f1:00:00:02:01", "label" : "TT" } +{ "router" : "fe:f0:00:00:02:01", "gateway" : "00:00:43:05:00:02", "label" : "TT" } +{ "primary" : "fe:f0:00:00:08:01" } +[...] + +License +------- + +alfred and vis are licensed under the terms of version 2 of the GNU General +Public License (GPL). Please see the LICENSE file. + +The file "packet.h" is an exception and not licensed with the GPL. Instead, +it is licensed using ISC license (see the head of this file). This allows +programs to include this header file (e.g. for communicating with alfred via +unix sockets) without enforcing the restrions of the GPL license on this third +party program. + +Contact +------- + +As alfred was developed to help on batman-adv, we share communication channels. +Please send us comments, experiences, questions, anything :) + +IRC: #batman on irc.freenode.org +Mailing-list: b.a.t.m.a.n@open-mesh.org (optional subscription + at https://lists.open-mesh.org/mm/listinfo/b.a.t.m.a.n) + +If you have test reports/patches/ideas, please read the wiki for further instruction +on how to contribute: + +http://www.open-mesh.org/projects/open-mesh/wiki/Contribute + +You can also contact the Authors: + +Simon Wunderlich siwu@hrz.tu-chmnitz.de +Sven Eckelmann sven@open-mesh.com

-[TODO: some more useful description here]